Automatic wrench.



J. A. STROMBERG.

AUTOMATIC WRENCH.

APPLICATIONFILED MAR. 17, I915.

Patented Mar. 6, 1917.

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AUTOMATIC WRENCH.

Specification of Letters Patent.

Patented Mar. 6, 1.917.

Application filed March 17, 1915. Serial No. 14,999.

To all whom it may concern 1 Be it known that I, JonL A. STROMBERG, a citizen of the Dominion of Canada, residing at New Norway, in the Province of Alberta and Dominion of Canada, have invented certain new and useful 1111provements in Automatic WVrenches; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to new and useful improvements in wrenches, and has for its principal object to provide a wrench which is particularly adapted for use on pipes or similar cylindrical bodies.

Another object of the invention is to provide a wrench in which the jaws will more firmly grip the body when pull is exerted on the handle. I

A further object of the invention is to provide a wrenchwhich is capable of exerting great compressive, force on the body upon which it is operating so that the teeth of the jaws will firmly bite thereinto and grip the same.

Still another object ofthe invention is to provide a wrench in which the jaws may be removed and jaws of a different character substituted so that the wrench may be used as an alligator or a nut wrench.

With these and other objects in View, the invention consists in the novel combination and arrangement of parts which will be fully set forthvin the following specification and accompanying drawings, in which, 1

Figure 1 is a sectional view showing the interior construction of the wrench, and

Fig. 2 is a view in elevation showing a modified form of jaw in place.

Referring now to the drawings by characters of reference, the numeral 1 designates as an entirety the casing of the wrench which comprises the side walls 2 and 3 which are connected by the end walls 4: and 5. These side walls 2 and 3 taper toward their forward ends so that the walls 1 and 5 are inclined and both of the walls 2 and 3 are formed with alining apertures for the reception of the pin 6 which is located centrally of the lateral extremities of the side walls and forms a pivotal connection for the handle 7. This handle 7 is provided with the rounded end 8, the use of which will appear as the description proceeds. Riveted or otherwise secured as at 9 to each of the walls 4 and 5 is a spring 10 which extends rearwardly and is arranged so that its free end bears against the levers of the jaws which will be more fully hereinafter described.

Formed near the reduced end of each of the walls 2 and 3 are apertures for the reception of the pins 11 by means of which the jaw members 12 and 13 are pivotally mounted in operative position. Each of these jaw members is formed with a rear Wardly extending lever 14 and provided with an enlargement 15 at the forward'end of the lever, the inner face of which is rounded as at 16 to cooperate with the rounded end 8 of the handle 7. The levers 1 1 extend parallel to the handle as clearly shown in Fig. 1 and provide a means for forcing the jaws together when the device is in use. In the jaws illustrated in Fig. 1, the jaw 12 is provided with the forward extension 17 having formed on its inner face the transversely extending ribs 18, and this extension 17 terminates in the inward extension 19 which is. provided on its inner face with the transversely extending teeth 20. These teeth 20, like the teeth 18, are arranged to bite into the surface of the article upon which the device is being used. Extending forwardly from the jaw member 13 is an extension 21 provided with the teeth 22 on its inner face, which teeth cooperate with the teeth 18 and 22 in gripping the body to be turned. v

It is to be understood that if so desired the pins 11 may be withdrawn and the jaws illustrated in Fig. 2, and designated by the numeral 23, maybe substituted, or if so desired, ordinary nut jaws may be provided which will cooperate in holding and turning nuts.

It will be apparent from the foregoing that in use the device is slipped over the end of the pipe or other body which is to be turned, and upon exerting pull on the handle 7 to throw the same into the dotted line position shown 'in Fig.1, it will be evident that the jaws will tighten upon the body and firmly grip the same, thereby enabling the user to easily and quickly thread pipes and the like in place. It will be evident that the harder the pull on the handle, the greater will be the biting force of the teeth 18, 20, and 22, and it will thus be seen that danger of the pipe or other body slipping will be minimized.

lVhile in the foregoing there has been shown and described the preferred embodiment of this invention, it is to be understood that such changes may be made in the combination and arrangement of parts as will fall Within the spirit and scope of the invention as claimed.

WVhat is claimed is:

A wrench including a tapering housing having opposite outwardly converging walls, a handle extending into the enlarged end of the housing and pivoted intermediate of its ends to the central portion of the housing and having its inner end rounded, a pair of jaws having enlarged body portions pivotally mounted in the housing at the re duced end thereof on opposite sides of and in advance of the rounded end of the handle, said body portions having concave inner faces at the rounded end of the handle and provided with reduced inwardly eX- tending arms terminating at the enlarged end of the housing, said handle substantially fitting the entire space between the arms When the jaws are in their normal position, said body portions being provided at their outer terminals with inclined gripping faces and one of the jaws having an outer inclined portion arranged approximately at right angles to the adjacent inclined gripping face and longitudinal springs secured at their outer ends to the converging walls of the housing and converging inwardly and bearing at their inner ends against the outer sides of the arms for normally holding the gripping faces of the jaws open.

In testimony whereof I afiix my signature in presence of two witnesses.

JOEL A. STROMBERG. Witnesses:

SAM JENsnN GYESDAL, JOHN PERSON.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. C. 

